16:5

class Solution {
public:
    int countNegatives(vector<vector<int>>& grid) {
        int coun=0;
        for(auto u:grid)
        {
            reverse(u.begin(),u.end());
          int lo=lower_bound(u.begin(),u.end(),0)-u.begin();
            coun+=lo;
        }
        return coun;

    }
};